The Church, whether or not it has a “label” (Roman Catholic, Baptist, Assembly of God, Lutheran, Orthodox, et al), stands against the tide. It is an institution that is universal; it is a body of believers and followers of the Way of Jesus. It is not to be divided up into merely geographical or cultural groupings. That is why, I believe, that the brother mentioned that the Holy Spirit leads believers against the wickedness of the world. It is definitely true that the Roman Catholic Church has maintained a consistent stance that is pro-life; however, it does not mean that other believers cannot do the same with constancy.
At the end of the day, even the Roman Catholic Church could be led astray by an imposter who would cast aside this cherished principle. At that point in time, if it were to happen, the individual believer would have to decide what the Holy Spirit, in light of Scripture, says about the sanctity of life. And, that decision is a no-brainer for the follower of Christ; LIFE is from God, and we value it above any challenging philosophy.
You have it exactly backwards. The RCC will never be led astray, individuals may be, but never the Church herself.
Matthew 16:18 And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it.